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3rd March 2011, 03:19 PM
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#1 |
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diyAudio Member
Join Date: Feb 2010
Location: Back in CT!
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Theta Data Mods?
I found this when I searched, so I guess it's a dead issue...
Recommended mods to a Theta Data Basic II transport However, I found some photos of a rather extensively modded Data Basic II on line, and was wondering if the experts here could comment on what was done and why. The site is all in Japanese, so I couldn't read any of it. It looks straight-forward; however when I try to search the maker of the clock, I get a japanese site. I assume there are englisg speaking sellers with similar (or better?) outboard clocks. Also, the hook-up is confusing to me. A GND and two CLK connections are shown. Is this correct? Is there a polarity or something that has to be adhered to? Anyway, here's some pics (outboard clock mod):
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"When the world is running down, you make the best of what's still around." Last edited by Jim Leach; 3rd March 2011 at 03:28 PM. |
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3rd March 2011, 03:20 PM
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#2 |
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diyAudio Member
Join Date: Feb 2010
Location: Back in CT!
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And here are the other mod photos I found:
It looks like the power switch is hooked directly to the fuse and input connection to bypass board traces I assume. That much I can figure out. The big yellow things: Filter caps maybe? Something else?
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"When the world is running down, you make the best of what's still around." Last edited by Jim Leach; 3rd March 2011 at 03:33 PM. |
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3rd March 2011, 03:24 PM
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#4 |
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diyAudio Member
Join Date: Feb 2010
Location: Back in CT!
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More photos of the mods:
I'm guessing the caps on the transport board wre up-graded; similar with the main board?
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"When the world is running down, you make the best of what's still around." Last edited by Jim Leach; 3rd March 2011 at 03:30 PM. |
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3rd March 2011, 03:25 PM
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#5 |
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diyAudio Member
Join Date: Feb 2010
Location: Back in CT!
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And still more!
Power supply caps probably changed, and a transformer was replaced with an R-core one, mounted forward of the original power board... Also, the SPDIF cablewas replaced here with a shielded one. I don't know the value of that mod inside a metal box, but... Some other caps have been changed as well.
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"When the world is running down, you make the best of what's still around." Last edited by Jim Leach; 3rd March 2011 at 03:32 PM. |
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3rd March 2011, 03:26 PM
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#6 |
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diyAudio Member
Join Date: Feb 2010
Location: Back in CT!
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Last three photos:
Close up of the output cable ans overview shots of the complete job.
__________________
"When the world is running down, you make the best of what's still around." Last edited by Jim Leach; 3rd March 2011 at 03:32 PM. |
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3rd March 2011, 04:29 PM
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#7 |
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Magneto the Gravity Man
diyAudio Member
Join Date: Mar 2005
Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)
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The aftermarket clock is similar to many available on Ebay.
http://cgi.ebay.co.uk/Low-Jitter-clo...item33556beada The clock module is available on its own. Valab 1PPM 11.2896 MHz Low Jitter TCXO on eBay (end time 09-Mar-11 17:05:57 GMT) Although other better clocks are available.. .
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If it ain't broke, break it !! Then fix it again. It's called DIY ! Last edited by poynton; 3rd March 2011 at 04:37 PM. |
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3rd March 2011, 04:33 PM
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#8 |
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diyAudio Member
Join Date: Feb 2010
Location: Back in CT!
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That appears to be the chip in the clock in my first post.
I assume I would need the rest of the board too... Maybe VALab sells the complete board?
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"When the world is running down, you make the best of what's still around." |
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3rd March 2011, 04:54 PM
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#9 |
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diyAudio Member
Join Date: Feb 2010
Location: Back in CT!
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I must have replied before you finished typing...
Anyway I am now watching those two items. It appears that board is different from the one in my first post, but should be workable. You mention 'better' clocks. Could you enlighten me further?
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"When the world is running down, you make the best of what's still around." |
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3rd March 2011, 07:15 PM
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#10 |
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Magneto the Gravity Man
diyAudio Member
Join Date: Mar 2005
Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)
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The board is different but almost the same if you look closely.
It's really the "chip" which makes the difference in this type of clock. Similar "chips" are available from Tent Labs. An example of a better clock is :- Premium low jitter clock cd player dac - Fidelity Audio on eBay (end time 19-Mar-11 19:45:50 GMT) andy .
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If it ain't broke, break it !! Then fix it again. It's called DIY ! |
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